Pump



' 4 A. F. FROUSSARD PUMP Filed Sept. 12. 1921 'INVENTOR;

Patented Uet. 3U, i923.

prairies ALBERT IE. FRO'USSAED, OF ST. LOUIS, MISSOURI.

PUMP.

Application filed September 12, v1%321.

To aZZ whom it may concern:

Be it known that I, ALBERT F. FROUSSARD, a citizen of the United States, residing at the city of St. Louis, in the State of Missouri, have invented certain new and useful Improvements in Pumps, of which the following is a specification.

This invention is a pneumatic pump of the kind commonly used for the inflation by muscular power of the tires of motor vehicles, bicycles, and the like. In such constructions a pump that will require the least amount of work to produce the required result has long been desired. It has been found in actual practice that the present pump fills a tire quicker than former constructions, or, to state the matter in another way, the same amount of muscular effort produces a multiplied result as compared to other pumps. In brief, with less work, a tire will be inflated more quickly with this pump than with others.

The above-mentioned desirable results are attributable to the (1) provision and combination in this pump of a piston so constructed that it has no hollow or cavity in its outside end or head, and thus with a flat surface equivalent to its entire area strikes flush with the bottom of the pump, closing the inside of the barrel, whereby all the air in the barrel is forced beyond the ball checkvalve that controls the exit of air into the tube; (2) the provision ofexpansible spring metallic packing or piston-rings; the provision of a bright inside finish for the barrel, permitting the piston and the spring metallic piston-rings to fit snugly thereagainst; (4:) the provision of oil-grooves in the piston; (5) the provision of a ball check-valve that prevents the air or compression in the hose from leaking back up through the pump on the upward stroke of the piston; (6) the provision of a quick acting light feather valve in the piston, which valve seats instantly upon the beginningof the downstroke of the piston; (7 the vertical connection at the side of the barrel of the hose, preventing its undue wear adjacent to the hose connection to the exit valve, thus preventing leakage at that point;

(8) and the absence of leather washers, or the like, that dry or burn and thus lose their original efficiency, 6r which from the beginning may not make tight contact with the inside wall of the barrel.

Serial no. 500,072.

The direction of boring the beginning of the outlet opening through the base casting Figure 3 is a sectional detail through the piston.

F or cheapness and simplicity of construction, this pump is made of as few parts as possible and for that reason the base casting 1 is made in one piece and so formed as to contain the valve-chamber 2, the passage 3 leading thereto with its branch 4, and the threaded opening 5 for the reception of the lower end dot the hose-connection T. A clamp 8 fastens the hose 9 to the stud 1.0 on the hose-connection 7, there being a passage 11 through the stud 10, hose-connection T, and the end 6. The usual footholds 12 extend from the base 1. The clamp 8 is fastened tightly in place in any usual or desired manner. I

A notch 13 is provided on the. interior circumference of the flange 14 forming part of base 1, which notch is opposite the opening 15 of branch-passage 4, which branch-passage 4 is arranged at such an angle as to point toward the said notch 13, the said direction of the said branch-passage i and the said notch cooperating together to allow the drilling of passage 4 by a straight drill and by direct action of the workman. The said passage 4 is drilled to a point where it connects with the vertical passage 3, similarly bored by a straight drill and direct approach of the workman. In other words, passages 3 and 4' are formed by two straight or direct bores, instead of by the use of right-angular tools or by casting. This is an especial and anecessary provision in this pump, for the reason that this invention contemplates that the exit from the barrel, i. e., the passage 4, shall be below by the flange 14. A step or recess of slight height and area is provided to prevent choking of the air in passages 1 and S and chamber 2.

The barrel 18 seats on the floor 19 of. base 1, within the cavity in the base formed by flange 1s, and is securely sweated the-rein, thus preventing leakage.

During the down stroke the mushroom valve 21 is seated, as shown in F igure 2, but during'the up-stroke of the piston 1.6 is unseated as shown in Figure 3. The valve 21 is borne by the stem 22, which is held in passage 23 through piston 16 by cotter l. p

The stem 22 fits loosely in the passage 23, so as to permit the flow of air through the space 33 between the stem 22 and the wall of the passage 23 when the valve 21 is unseated upon .the ascent of the piston 16. The intermediate portion 3 1 of the stem 22 is of smaller diameter than the end portions 35, for the purpose of enlarging the s} the stem. 7

The piston 16 is attached by pin 25 to piston-rod and the latter to handle 2?. An air-vent 28, to prevent binding, is located in the head 29.

A ball check-valve o0 prevents regress of air that has been forced out of passage 3 into chamber 2. Therefore with each clownstroke of the piston 16 the air is stepped up into chamber 2, passage'11, hose 9, and the object to be inflated. "t will be observed that the hose-connection 731s in vertical alignment with the passage 3, and that therefore the hose 9 is attached vertically thereto, which results in the arrangement of hose 9 as shown in Figure 1 parallel to the barrel 18, which not only causes the pump to occupy less space when packed away not in use, but also prevents unnecessary wear of the hose 9 adjacent to the connection 7 thereof with base 1, because in this construction the hose 9 is- )ace 33 and, also, decreasing the weight of not bent when not in use. This results in greatly prolonging the life of the hose 9.

The piston-rings 31 are metallic and are so formed as to be expanded closely against the smooth-finished interior of barrel 18,

thereby forming a tight fit and preventing leakage. As shown in the drawings there are eleven points. of contact for the piston with the interior wall of barrel 18,, the oil-grooves .32 being the only break or breaks in the continuity ofsuch contact, and the oil itself acting as a'seal.

Having thus described this invention, I hereby reserve the benefit of all changes in form, arrangement, order, or use of parts,

as it is evident that many minor changes may be made therein without departing from the spirit of this invention or the scope of the following claim.

1 claim:

A piston head of the character described having means centrally ol its upper end for lacilitatingthe rigid connection of a piston rod thereto and provided near one side with a straight longitudinal cylindrical passage enlarged at the lower" side 01' the piston, a stem freely movable in said passage and having a valve head on its lower end normally occupying, by gravity, a lowered open position, and means carried by the upper end of the valve stem and engageable with the upper surfaceof the pistonI head to limit the downward opening movement of said valve head for maintaining the- ALBERT 'F. FROUSSARD. 

